Watchmaker&#39;s tool



Nov. 2, 1937. .1. H. MEINHARDT Er A1.

WATCHMAKER S TOOL Filed Jan. 2, 1936 INVENTORS Joseph H. Menhard 0:72a? Samuel/'. Coffman,

ATTORNEY.

Patented Nov. 2, 1937 UNITED STATES pagina PATENT @FFME WATCHMAKERS TOOL Joseph H. Meinhardt and Samuel M. Coffman, Kansas City, Mo.; said Coiman assigner of one-fourth to said Meinhardt O-ur invention relates to a watchmakers tool designed more particularly for removing and replacing cannon pinions, and our object is to provide a device o-f this character which will enable 5 a watchmaker to readily remove or replace a cannon pinion Without damaging the same and which will also hold said cannon pinion after removal so that it cannot become lost while awaiting replacement in the watch.

l A further object is to provide a simple and inexpensive device of this character which is well adapted for the purpose intended, and in order that the invention may be fully understood, reference will now be had to the accompanying Fig. 1 is a side elevation of the tool.

Fig. 2 is a front elevation of the tool.

Fig. 3 is an enlarged broken vertical section of the tool in initial position for removing a cannon pinion. l

Fig. 4 shows the tool gripping the cannon pinion preparatory to removing it from its stub shaft.

Fig. 5 shows the position of the parts after re- 25 moving the cannon pinion from its stub shaft.

Fig. 6 is an enlarged broken detail view of two jaws of a chuck which operates in a plunger forming part of the invention.

Fig. 7 is an enlarged detail view of the plunger.

Fig. 8 is an enlarged sectional view of a tubular member in which the plunger operates.

Fig. 9 is an enlarged View of the chuck.

Fig. 10 is a broken detail sectional View of a modified form of the device.

35 Referring in detail to the different parts, 2

designates a tubular member provided intermediate its ends with a handle d.

8 designates a hollow plunger provided at its lower end with a reduced orice S adapted to pass 40 over the hub C of the cannon pinion A and an enlargement D on the upper portion of said hub. The plunger 8 is reciprocably mounted in the tubular member 2 and provided with means for causing the resilient jaws l2 at the lower end of 45 a tubular chuck I4 to grip. the hub C preparatory toremoving the cannon pinion A from the stub shaft B. An example of said means is illustrated by the internally beveled surface I6 at the lower part of the plunger 3. The jaws I2 are tapered 50 for engagement with the beveled surface ID and the underside of the enlargement D on the upper portion of the hub C.

The chuck I4 is reciprocably mounted `within the plunger 8 and yieldably held against the beveled surface I0 by means of a coil spring 2U arranged within the plunger 3 and bearing at its lower end upon the chuck Iii and at its upper end against a ball 22 operably located in the upper portion of the plunger 3.

The ball 22 is held by the spring 2l] against the underside of a lever 26 having a recessed forward portion 25 and a concave cam 32 to cooperate with the ball 22, as will hereinafter appear. 'Ihe lever 26 is provided with a notched'portion 2% operably mounted in a slot 36in the upper forward portion of the plunger 3 which latter has a slot 3| in its rear portion through which the forward part of the lever 26 extends. The concave cam 32 projects into a notch 3 in the upper rear portion of the tubular member 2, which also has a notch 36 diametrically opposite the notch 34 for reception of the forward end of the lever 26 which limits the downward movement of theplunger by contacting the bottom` of said notch 34, as vshown by Fig. 3.lv The lever 26 is provided at its rear end with a knob 35, so that it may be readily operated by the thumb of the hand which grasps the handle All. The plunger 8 is yieldably held in lowered position', Figs. 2 to 4, inclusive, by a spring 36 which is much weaker than the spring 20 land interposed between an internal -vshoulder 39, in the'tubular member 2, and an external'shoulder 4I) on the lower portion of the plunger 8.

In practice, when it is desired to remove the cannon pin A from its stub shaft B the device is lowered until the plunger 3 passes over the hub C and rests upon the cannon pinion A, as shown by Fig. 3'. The lever 26 is then swung downwardly to the position shown by Fig. 4, causing the cam 32 to depress the ball 22 which in turn compresses the spring 2Il, causing it to depress the chuck I4 until the tapered jaws I2 are firmly yclosed by the beveled inner surface Iii of the plunger 3 around the hub C. Continued downward movement of the lever 26 causes the cam 32 to press against the lower end of the notch 34 and force the tubular member 2 down against the action of spring 38 until the lower end of said tubular member 2 passes over the pinion A and rests upon the watch plate b while the forward end of the lever 26 lifts the plunger 3 with the chuck I4 which loosens and lifts the cannon pinion A from its stub shaft B, Fig. 5. The tool still grasping the cannon pinion A is then removed from the watch and the lever 25 is permitted to swing upward slowly to the position shown by Fig. 4, where it is checked by its forward end contacting the bottom of the notch 36 in the tubular member 2. The spring 20 remains under sufcient pressure to cause the chuck I4 to continue to hold the cannon pinion A until the latter is replaced upon the stub shaft B, whereupon the protruding ends of the jaws I2 are pressed down against the cannon pinion A until they are forced inwardly from the orice 9 far enough to permit them to expand and release the hub C, so that the tool can be removed Without removing the cannon pinion A therewith. While we have stated that the tool holds the cannon pinion A after the same has been lifted from the stub shaft B, it is to be understood that the jaws I2 may be forced to release the cannon pinion by rocking the lever 26 upwardly on the bottom of the notch 36 until the pressure of the spring 20 on the chuck I4 has been relieved sufliciently to let the jaws I2 expand to the position shown by Figs. 3 and 6.

The modified form of device shown by Fig. 10 is somewhat similar in construction and operation to the form above described as is evidenced by corresponding reference numerals with exponents a, the exceptions being that a presser element 22aI is substituted for the ball 22, the lever 26a is fulcrumed upon a pin 30a instead of in the slot .'l and has convex cams 25a and 32a, instead of the recess 25 and the cam 32.

From the foregoing description it is apparent that we have provided a watchmakers tool whereby cannon pinions may be removed or replaced in watches Without danger of damaging or losing said cannon pinions, and while we have shown and described two embodiments of the invention we reserve all rights to such lother forms and modifications thereof as properly fall within the spirit and scope of the invention as claimed.

Having thus described our invention, what We claim and desire to secure by Letters Patent, is:

1. A device of the character described comprising a tubular member, a hollow plunger reciprocably mounted in said tubular member and' provided with an internally beveled portion, a chuck reciprocably mounted within said plunger and provided with resilient jaws adapted to be closed when forced to slide upon said beveled portion, a spring adapted when compressed sufliciently to exert enough pressure on said chuck to slide the jaws upon the beveled portion, and means for compressing said spring.

2. A device of the character described comprising a tubular member, a hollow plunger reciprocably mounted in said tubular member and provided with an internally beveled portion, a chuck reciprocably mounted within said plunger and provided with resilient jaws adapted to be closed when forced to slide upon said beveled portion, a spring adapted when compressed beyond normal to depress said chuck and thereby slide the jaws upon the beveled portion, a ball resting upon said spring, and manually operated means fo'r forcing said ball to compress rthe spring beyond normal.

3. A device of the character described comprising a tubular member, a hollow plunger reciprocably mounted in said tubular member and provided with an internally beveled portion, a chuck reciprocably mounted within said plunger and provided with resilient jaws adapted to be closed when forced to slide upon said beveled portion, a spring adapted when compressed beyond normal to depress said chuck and thereby slide the jaws upon the beveled portion, an element resting upon said spring, and a lever adapted to force said element to compress the spring beyond normal and also move the plunger in one direction and the tubular member in the opposite direction.

4. A device of the character described comprising a tubular member, a hollow plunger reciprocably mounted in said tubular member and provided with an internally beveled portion, a chuck reciprocably mounted within said plunger and provided with self-opening jaws adapted to be closed when forced to slide upon said beveled portion, a spring adapted when compressed beyond normal to depress said chuck and thus slide the jaws upon the beveled portion, a ball resting upon said spring, a lever adapted to force said ball to compress the spring beyond normal and also move the tubular member in one direction, and cam means on said lever for moving the plunger in the opposite direction from that in which the tubular member is moved.

5. A `device of the character described comprising a tubular member, a hollow plunger reciprocably mounted in said tubular member and provided with an internally beveled portion, a chuck reciprocably mounted within said plunger and provided with resilient jaws adapted to be closed when forced to slide upon said beveled portion, a spring adapted when compresed beyond normal to depress said chuck and thus slide the jaws upon the beveled portion, a ball resting upon said spring, a lever adapted to force said ball to compress the spring beyond normal and thus force the jaws to slide upon the beveled portion, said lever also being adapted to move the plunger in one direction and the tubular member in the opposite direction, and means for restoring the tubular member and the plunger to normal position.

6. A device of the character described comprising a tubular member, a hollow plunger reciprocably mounted in said tubular member and provided at one end with an orifice and means for directing the jaws of a chuck to said orifice, a chuck reciprocably mounted in said plunger and provided with tapered jaws adapted to pass part way through said orifice and be closed by the surrounding wall of the latter, and mechanism for forcing the chuck towards the orice until the jaws protrude from and are closed by the surrounding wall of the orifice.

7. A device of the character described comprising a tubular member, a hollow plunger reciprocably mounted in said tubular member and provided with means for closing the jaws of a chuck, a chuck reciprocably mounted within said plunger and provided with self-opening jaws adapted to be closed when forced to slide upon said jaw-closing means, coacting means for forcing said chuck in a direction to slide the jaws upon the jaw-closing means, and also move the plunger in one direction and the tubular member in the opposite direction, an external shoulder on the plunger, an internal shoulder on the tubular member, and a coil spring interposed between said shoulders and adapted to restore the plunger and the tubular member to normal position.

8. A device of the character described comprising a tubular member, a plunger reciprocably mounted in said tubular member and provided with a reduced orifice, a chuck operably-mounted in said plunger having jaws adapted to enter said orifice and be forced by the surounding wall thereof toward each other to grip an object, a lever fulcrumed in the plunger, and means interposed between the chuck and said lever and adapted to coact with the latter in forcing the chuck towards the orifice.

9. A device of the character described comprising a tubular member, a handle projecting from said tubular member, a plunger reciprocably mounted in said tubular member and provided with a reduced orifice, a chuck operably-mounted in said plunger having resilient tapered jaws adapted to enter said orifice and be forced by the surrounding wall thereof toward each other to grip an object, a lever fulcrumed in the plunger and projecting over the handle, and means interposed between the chuck and said lever and adapted to coact with the latter in forcing the chuck towards the orice.

10. A device adapted to release cannon pinions from their stub shafts in watches comprising a chuck having jaws adapted to grip a cannon pinion, a plunger adapted to rest on the pinion and provided with means adapted to force the jaws to grip the pinion, a tubular member adapted to receive the pinion and in which said plunger is reciprocably mounted, and means adapted to force said tubular member down against the watch and lift the plunger and the chuck until the pinion is released from the stub shaft.

11. A device adapted to release cannon pinions from their stub shafts in watches comprising a chuck having jaws adapted to grip a cannon pinion, a plunger adapted to rest on the pinion and provided with means adapted to force the jaws to gripthe pinion, a tubular member adapted to receive the pinion and in which said plunger is reciprocably mounted, a lever fulcrumed in the plunger and provided with cam means, means interposed between the chuck and said cam means adapted to coact with the latter in forcing the tubular member against the watch and the plunger with the chuck away from the watch until the pinion is released from the stub shaft, and a handle projecting from the tubular member.

JOSEPH I-I. MEINHARDT. SAMUEL M. COFFMAN. 

